Chai / Carter Deformation Analysis in Soft Ground Improvement

2011
ISBN: 978-94-007-1721-3
Verlag: Springer Netherland
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, Band 18, 250 Seiten, eBook

Reihe: Geotechnical, Geological, and Earthquake Engineering

This book deals with the behaviour of soft ground improved by some of the more common methods, including the installation of prefabricated vertical drains (PVDs), or the installation of soil-cement columns formed by deep mixing, or the preloading of soft ground by application of a vacuum pressure in addition to, or instead of, a surcharge loading.  In particular, it describes the theories and the numerical modelling techniques that may be applied to these soft ground improvement schemes to estimate the immediate and time-dependent mechanical response of the in situ soil.  Particular emphasis has been placed on methods that reliably predict ground deformations associated with ground improvement techniques.

The book commences with a brief description of the various ground improvement methods and then describes general techniques for modelling the behaviour of soft clay subsoils by the finite element method, as well as details of the methods for modelling soft soils improved by the installation of PVDs.  It also includes chapters describing the theory of vacuum consolidation and methods for calculating vacuum pressure-induced ground deformation, as well as a theory which can be used to predict the response of soft ground improved by the installation of soil-cement columns.  An important distinguishing feature of this book is the routine use of comparisons of predictions of the proposed models with the results of laboratory studies, and particularly field case studies, in order to validate the proposed methods of analysis.  The field case histories are from soft soil sites at various locations around the world.

The book is directed towards students of geotechnical engineering as well as geotechnical practitioners.  In the main it provides complete derivations of most of the important theoretical results, as the intention was to write a book that could be used as both a teaching text and a reference work for students and practitioners.

Audience: The book is intended for geotechnical practitioners as well as for students.

Zielgruppe

Research

Autoren/Hrsg.

Chai, Jinchun

Carter, John P.

Inhaltsverzeichnis

PrefaceNotation1 Introduction1.1 What is ground improvement and when and why is it necessary?1.2 Techniques of ground improvement1.3 Why do we need to estimate ground deformations?1.4 What is this book all about?1.5 References2 Modelling Soft Clay Behaviour2.1 Introduction2.2 Initial stiffness and undrained shear strength2.3 Modelling the embankment construction process2.4 Effect of large deformations on embankment stability2.5 Buoyancy effects due to large deformation2.6 Summary2.7 References3 Vertical Drains3.1 Consolidation theory for prefabricated vertical drains3.2 Parameter determination3.3 Optimum PVD installation depth3.4 Two-dimensional modelling of PVD-improved soil3.5 Modelling a large scale laboratory test3.6 Application to a case history3.7 Summary3.8 References4 Vacuum Consolidation4.1 Introduction4.2 Field methods for vacuum consolidation4.3 Theory of consolidation due to vacuum pressure4.4 Characteristics of vacuum consolidation4.5 Optimum PVD penetration depth4.6 Estimating deformations induced by vacuum pressure4.7 Deformations associated with the vacuum-drain method4.8 Summary4.9 References5 Soil-cement Columns5.1 Introduction5.2 Settlement predictions5.3 Degree of consolidation5.4 Settlement – time curve5.5 Deformations induced by column installation5.6 Summary5.7 References6 Concluding Remarks6.1 What else needs to be done?6.2 Hybrid soft ground improvement techniques6.3 ReferencesIndex